/Engine/Plugins/Experimental/UIFramework/Source/Public/Types/UIFWidgetTree.h
A valid snapshot of the widget tree that can be replicated to local instance. Authority widgets know their parent/children relation. That information is not replicated to the local widgets. When a widget is added to the tree, the tree is updated. The widget now has to inform the tree when that relationship changes until it's remove from the tree.
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FUIFrameworkWidgetTree : public [FFastArraySerializer](API\Runtime\NetCore\Net\Serialization\FFastArraySerializer)
FUIFrameworkWid...
AuthorityOnWidgetAdded
FUIFrameworkWid...
AuthorityOnWidgetRemoved